Abstract
In 2003 and 2004, the ISO/IEC MPEG standardization committee added two amendments to their MPEG-4 audio coding standard. These amendments concern parametric coding techniques and encompass Spectral Band Replication (SBR), Sinusoidal Coding (SSC), and Parametric Stereo (PS). In this paper, we will give an overview of the basic ideas behind these techniques and references to more detailed information. Furthermore, the results of listening tests as performed during the final stages of the MPEG-4 standardization process are presented in order to illustrate the performance of these techniques.
Highlights
The MPEG-2 Audio coding standard was released in 1997 and has successfully found its way into the market
From the listening tests it is clear that the Spectral Band Replication (SBR) enhanced as that of the core coder (AAC) technology (High Efficiency AAC Profile) performs better than the MPEG-4 AAC Profile when the latter is operating at a 25% higher bit rate (i.e., 30 versus 24 kbps for mono, and 60 versus 48 kbps for stereo)
Since the bandwidth extension enabled by SBR is in principle completely orthogonal to the channel extension provided by the Parametric Stereo (PS) tool introduced in Section 3.2, it is of interest to combine both tools in order to utilize the coding gain of both tools simultaneously
Summary
The MPEG-2 Audio coding standard was released in 1997 and has successfully found its way into the market. Close to the finalization of the work on parametric coding, it was demonstrated that the parametric stereo (PS) module that was developed in the course of the this work item could be combined with the bandwidth extension technology thereby providing a significant additional boost in coding efficiency. This particular combination was subsequently added to the parametric coding amendment. This paper has the intention to outline the ingredients of the MPEG-4 Audio Amendments in a comprehensive way Part of this material is present in the literature but mostly scattered.
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